34.2.1 GPIO Input Characteristics Figure 34-15. I/O Pin Input Hysteresis vs. VDD Figure 34-16. I/O Pin Input Threshold Voltage vs. VDD (T = 25°C) Figure 34-17. I/O Pin Input Threshold Voltage vs. VDD (VIH) Figure 34-18. I/O Pin Input Threshold Voltage vs. VDD (VIL)